<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script type="text/javascript" src="CommonUtil/CommonUtil.js"></script>
    <script type="text/javascript" charset="utf-8">
        //门面模式的概念，简化API接口 最经典的就是事件
        function a(x) {
            //do something
        }
        function b(y) {
            //do something
        }
        function ab(x,y) {
            a(x);
            b(y);
        }
    </script>
</head>
<body>
</body>
</html>